Hex Bolt ARP Grade 8 Alloy Steel Black Model 651-2000

Description

Product Overview

ARP’s Hex Bolt Model 651-2000 is engineered for demanding environments where strength, precision, and reliability are non‑negotiable. Constructed from high‑grade alloy steel, the bolt meets Grade 8 specifications, delivering a tensile strength that exceeds standard fasteners. The black machined exterior not only provides a corrosion‑resistant barrier but also reduces visual glare in engine bays and performance applications. Featuring a 5/16‑18 right‑hand thread, the bolt offers a consistent pitch that simplifies torque application and minimizes the risk of thread stripping. The hex head design aligns with common socket and wrench sizes, allowing technicians to install or remove the fastener quickly without specialized tools. Each package contains five meticulously inspected bolts, each weighing approximately 4.9 ounces, ensuring uniform performance across the set. The product complies with industry standards for automotive performance engine main bolts and studs, earning a ranking among the top items in its category.

Usage

Designed primarily for automotive and high‑performance engine assemblies, this hex bolt excels in applications such as cylinder head mounting, crankshaft securing, and transmission housing attachment. Its robust construction makes it suitable for both street‑legal vehicles and race‑track machines, where vibration resistance and torque retention are critical. The bolt’s compatibility with a 5/16‑18 thread pitch means it fits a wide range of OEM and aftermarket components, providing flexibility for mechanics, restorers, and performance enthusiasts. Whether you are rebuilding a classic muscle car, upgrading a modern sports sedan, or performing routine maintenance on a heavy‑duty truck, the ARP hex bolt delivers consistent clamping force and long‑term durability. The black finish also helps conceal wear and grime, maintaining a professional appearance even after repeated service cycles.

Why Choose Us

Choosing ARP means selecting a brand with decades of engineering expertise and a reputation for precision fasteners. Each bolt undergoes rigorous quality control, including hardness testing, dimensional verification, and surface finish inspection, ensuring that every piece meets the stringent Grade 8 criteria. The alloy steel composition is carefully balanced to provide high tensile strength while resisting fatigue under cyclic loads. ARP’s manufacturing process incorporates a controlled heat‑treatment cycle that enhances hardness without compromising ductility, resulting in a fastener that can absorb shock and maintain torque over time. Additionally, the company offers comprehensive technical support, detailed installation guidelines, and a responsive customer service team ready to assist with fitment questions or warranty claims. By purchasing this bolt, you benefit from ARP’s commitment to durability, performance, and after‑sales service that extends beyond the point of sale.

Key Features

• Grade 8 alloy steel provides exceptional tensile strength for high‑stress applications.
• Black machined finish resists corrosion and reduces visual wear in engine environments.
• 5/16‑18 right‑hand thread ensures a secure, repeatable fit across a variety of automotive components.
• Hex head design allows fast installation with standard tools, saving time during assembly or service.
• Comes with dedicated ARP customer support and warranty for peace of mind after purchase.

FAQ

What does Grade 8 mean for this hex bolt?

Grade 8 indicates that the bolt meets a specific set of mechanical property standards, including a minimum tensile strength of 150,000 psi. This classification ensures the fastener can handle high loads and resist deformation in demanding automotive and performance engine applications.

Can I use this bolt in a non‑automotive setting?

While the bolt is optimized for automotive and engine use, its robust construction makes it suitable for any high‑stress mechanical assembly, such as industrial machinery, heavy‑duty equipment, or custom fabrication projects that require a reliable, high‑strength fastener.

Is the black finish purely cosmetic, or does it provide functional benefits?

The black machined finish serves both aesthetic and functional purposes. It creates a protective layer that helps prevent corrosion, reduces glare in tight engine bays, and hides surface wear, extending the visual lifespan of the bolt in harsh environments.

How do I determine the correct torque setting for this bolt?

ARP provides torque specifications in the product documentation based on the bolt size and material. For the 5/16‑18 Grade 8 hex bolt, a typical torque range is 70‑80 ft‑lb, but you should always consult the vehicle or equipment manufacturer’s guidelines to ensure proper clamping force.

What warranty does ARP offer on this product?

ARP backs its fasteners with a limited warranty that covers manufacturing defects and material failures under normal use. If you encounter any issues, contact ARP’s customer service with your purchase details, and they will guide you through the warranty claim process.